That happens to OE coatings of Nissan wheels. My 07 G35 sedan had exactly the same problem. Claying the crap out of it seemed to help a little, but didn't completely cleaned them off. Also, I think it's the brake dust that gets baked into the wheels that causes this problem.
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Rota wheels give me nightmare. Thus, it makes Rota wheels the wheels of my dreams. *barf*
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